CN110138007B - Multi-mode operation control method of single-phase cascade type light storage and mixing system - Google Patents
Multi-mode operation control method of single-phase cascade type light storage and mixing system Download PDFInfo
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- CN110138007B CN110138007B CN201910431485.2A CN201910431485A CN110138007B CN 110138007 B CN110138007 B CN 110138007B CN 201910431485 A CN201910431485 A CN 201910431485A CN 110138007 B CN110138007 B CN 110138007B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000005611 electricity Effects 0.000 claims abstract description 36
- 238000010248 power generation Methods 0.000 claims abstract description 23
- 238000007599 discharging Methods 0.000 claims abstract description 12
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- 230000006641 stabilisation Effects 0.000 claims abstract description 3
- 238000011105 stabilization Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000010363 phase shift Effects 0.000 claims description 4
- 230000018199 S phase Effects 0.000 claims description 2
- 238000005286 illumination Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/383—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a multi-mode operation control method of a single-phase cascade type light storage hybrid system, which divides the daytime photovoltaic power generation time period of the peak time electricity price into a stabilization fluctuation mode according to the difference between the peak time electricity price and the non-peak time electricity price of the time electricity price and the characteristic that a photovoltaic power generation system only generates power in the daytime, utilizes a storage battery to stabilize the power fluctuation in the photovoltaic power generation, and assists the photovoltaic battery to discharge; dividing the daytime photovoltaic power generation time period of off-peak electricity price into a self-charging mode, absorbing all active power generated by photovoltaic by using a storage battery, and only externally compensating reactive power for the whole photovoltaic grid-connected system; dividing the photovoltaic non-power generation period at night into a night mode, taking the photovoltaic cell as a static synchronous compensator, and finishing charging and discharging work at night by the storage battery; and dividing the night peak time electricity price time period into a night discharging working state according to the time-of-use electricity price, and dividing the night non-peak time electricity price time period into a night charging working state. The invention ensures the all-day economic operation of the photovoltaic grid-connected system.
Description
Technical Field
The invention relates to a photovoltaic power generation technology, in particular to a multi-mode operation control method of a single-phase cascade type light storage hybrid system.
Background
The single-phase cascade type light storage hybrid system has the characteristics of stabilizing photovoltaic power fluctuation, transformer-free grid connection, wide-range reactive compensation, photovoltaic and storage battery independent maintenance and the like, and is widely applied to the field of photovoltaic power generation. At present, most of researches on a cascade type light storage and hybrid system are focused on improving grid-connected quality, for example, research on control strategies of a single-phase hybrid cascade type photovoltaic inverter with energy storage (Guiyuan, hubei university of industry, 2018) discloses a coordination control method of a cascade type photovoltaic grid-connected inverter, the effect of stabilizing photovoltaic fluctuation by utilizing energy storage is optimized by utilizing a super capacitor, and the grid-connected quality is improved. However, the method only considers the condition of sufficient illumination, and the night time with insufficient illumination or even no illumination is not considered. However, the effective power generation time of the photovoltaic system is concentrated in the daytime, the power generation peak period is in the noon to the afternoon, the power consumption peak of the power system is in the evening, and the noon is in the non-peak power consumption period, so that the serious contradiction between the power generation amount and the power consumption is caused, and the popularization of time and electricity prices obviously indicates that the operation of a working mode cannot meet the requirements of the photovoltaic grid-connected system, and a multi-mode power coordination distribution method with more economic benefits is urgently needed.
Disclosure of Invention
The invention aims to provide a multi-mode operation control method of a single-phase cascade type light storage hybrid system.
The technical solution for realizing the purpose of the invention is as follows: a multi-mode operation control method of a single-phase cascade type light storage hybrid system comprises the steps of dividing daytime photovoltaic power generation time periods of peak-time electricity prices into a steady fluctuation mode according to the difference between peak-time electricity prices and non-peak-time electricity prices of the time electricity prices and the characteristic that a photovoltaic power generation system generates power only in daytime, and utilizing a storage battery to stabilize power fluctuation in photovoltaic power generation to assist a photovoltaic battery in discharging; the daytime photovoltaic power generation time interval of off-peak electricity price is divided into a self-charging mode, all active power generated by photovoltaic is absorbed by a storage battery, and the whole photovoltaic grid-connected system only compensates reactive power externally; dividing the photovoltaic non-power generation period at night into a night mode, taking a photovoltaic cell as a static synchronous compensator, and finishing charging and discharging work at night by a storage battery; and then dividing night peak time electricity price time intervals into night discharging working states according to the time-of-use electricity prices, and dividing night off-peak time electricity price time intervals into night charging working states.
Compared with the prior art, the invention has the following remarkable advantages: 1) The photovoltaic system is powered by full power when working at peak, and the economic operation state of storing electricity by electricity price when not working at peak improves the economic benefit; 2) The photovoltaic cell panel and the storage battery can be independently maintained and controlled; 3) The system has wide-range active and reactive compensation, and improves the quality of electric energy; 4) The balance control of the storage battery and the capacitor is realized, and the usability of the system is enhanced.
Drawings
FIG. 1 is a schematic diagram of distribution of time-sharing electricity prices and working modes of 20-35kv industrial electricity in Jiangsu province.
FIG. 2 is a schematic diagram of the hierarchical control of the present invention.
FIG. 3 is a schematic view of the night control of the present invention;
fig. 4 is a diagram of an active power waveform of the present invention to smooth ripple mode.
Fig. 5 is a diagram of the active power waveform for the self-charging mode of the present invention.
Fig. 6 is a waveform diagram of active power in the night mode discharging operation of the present invention.
Fig. 7 is a diagram of an active power waveform for the night mode charging operation of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
The light storage hybrid system is a cascade grid-connected structure configured with M photovoltaic cells and N storage batteries, wherein an L filter is used for eliminating harmonic waves, and in order to ensure the all-day economic operation of the photovoltaic grid-connected system, the multi-mode operation control method of the single-phase cascade type light storage hybrid system divides the all-day operation of the system into a stabilizing fluctuation mode, a self-charging mode and a night mode according to the characteristics of time electricity price and the photovoltaic power generation system only generating electricity in the daytime, wherein the stabilizing fluctuation mode is in the peak time electricity price time period in the daytime, the self-charging mode is in the non-peak time electricity price time period in the daytime, and the night mode is in the night time period; and the night mode is divided into a discharging operation state during a night peak electricity rate period and a charging operation state during a night off-peak electricity rate period. Taking a place in Jiangsu province as an example, the specific division of the time period is shown in FIG. 1.
The fluctuation stabilizing mode utilizes the storage battery to stabilize power fluctuation in photovoltaic power generation and assists the photovoltaic battery to discharge so as to meet the demand of power system scheduling. The hierarchical control method for realizing the stabilizing fluctuation mode is shown in fig. 2, and comprises the following specific steps:
(1) Scheduling commands and voltage u from power system PQ s Calculating to obtain a grid-connected reference current i ref * The calculation formula is shown as (1), the upper layer controller receives a grid-connected reference current instruction, generates an upper layer power supply instruction through the PR controller and transmits the upper layer power supply instruction to the lower layer controller;
(2) The lower layer controller is divided into a photovoltaic controller and a storage battery controller, and first the photovoltaic controller receives the output voltage v of each photovoltaic unit pvm (m is a positive integer and 0<m<M) and a current i pvm Independent mppt control is carried out to obtain the maximum power voltage v pvm * Then the maximum power voltage v is tracked by the PI controller pvm * With the actual photovoltaic voltage v pvm The error between them, finally, the unit current command vector i is superimposed ref * The voltage stabilization is used for obtaining a modulation signal of each photovoltaic cell;
(3) The storage battery controller receives a difference signal of the sum of the upper power supply instruction and all photovoltaic battery instructions, performs battery SOC balance control, and generates a modulation signal of each storage battery;
(4) And inputting the modulation signal of each photovoltaic cell and the modulation signal of each storage battery into a carrier phase shift modulator (PS-SPWM) to generate a driving signal and drive the circuit.
The self-charging mode is characterized in that the grid-connected reference current iref is obtained by calculating a power system Q scheduling instruction and is input into the control system, and the calculation formula is shown as a formula (2).
In the night mode, the photovoltaic cell does not generate power any longer, the photovoltaic cell is used as a static synchronous compensator (STATCOM) to play a role in the system, the storage battery completes charging and discharging work at night, and the night mode is realized by specifically adopting power control and balance control, as shown in fig. 3, the night mode comprises the following steps:
(1) The power control comprises a storage battery open-loop voltage control and a capacitor closed-loop current control, wherein the storage battery open-loop voltage control is carried out according to a fixed modulation ratio K and an open-loop voltage phase alpha, and a power grid voltage u calculated by the phase s Phase theta, generating a battery module modulation signal u bat (ii) a In the closed-loop current control of the capacitor, closed-loop control is carried out on the sum of direct current voltage of the capacitor to generate direct current voltage error, then current phase sin beta and amplitude calculated by phase are superposed to generate grid-connected reference current i ref Then, capacitor closed-loop current control is carried out, and finally, voltage feedforward is added to eliminate voltage fluctuation and generate a capacitor module signal u cap ；
(2) The balance control comprises battery SOC balance control and capacitor voltage balance control, and respectively receives the battery module modulation signal u bat And capacitor module modulation signal u cap Balancing the SOC of each storage battery and the voltage of each capacitor by adopting an active voltage vector superposition method to generate a modulation signal of each storage battery unit and each capacitor unit; the modulated signal for each battery and the modulated signal for each capacitor are then input to a carrier phase shift modulator (PS-SPWM) to generate a drive signal to drive the circuit.
Examples
To verify the effectiveness of the inventive scheme, simulation verification was performed using MATLAB/Simulink. The system is configured to two photovoltaic cells and two storage batteries in simulation, and fig. 4 to 7 respectively show the distribution of active power in three working modes. In the stabilizing fluctuation mode, the illumination condition in the simulation is changed as follows: the illumination intensity of the photovoltaic cell is reduced from 1000W/m to 600W/m at 4s 2 6s return to 800W/m 2 And when the time is 8s, the active power waveform is reduced to 400W/m < 2 >, in the mode, as shown in fig. 4, the output active power of the photovoltaic cell is continuously changed along with the change of the illumination intensity, and the storage battery can rapidly respond to the change of the output of the photovoltaic cell to ensure that the total output active power of the whole photovoltaic grid-connected system is enabled to be changedAnd the system scheduling is satisfied after the system scheduling is kept unchanged. In the self-charging mode, the illumination change is consistent with the stabilizing fluctuation mode, the active power waveform in the mode is shown in fig. 5, and it can be seen that the active power is not output by the whole photovoltaic grid-connected system at the moment, and how much electricity is absorbed by the photovoltaic power generation storage batteries. The night mode is divided into a discharging operation state and a charging operation state, the capacitor does not output active power, and the system discharging and charging operations are performed by the storage battery as shown in fig. 6 and 7.
Claims (1)
1. A multi-mode operation control method of a single-phase cascade type light storage and mixing system is characterized in that firstly, according to the difference between the peak time electricity price and the non-peak time electricity price of the time electricity price and the characteristic that a photovoltaic power generation system only generates power in the daytime, the daytime photovoltaic power generation time period of the peak time electricity price is divided into a stable fluctuation mode, power fluctuation in photovoltaic power generation is stabilized by a storage battery, and the photovoltaic battery is assisted to discharge; the daytime photovoltaic power generation time interval of off-peak electricity price is divided into a self-charging mode, all active power generated by photovoltaic is absorbed by a storage battery, and the whole photovoltaic grid-connected system only compensates reactive power externally; dividing the photovoltaic non-power generation period at night into a night mode, taking the photovoltaic cell as a static synchronous compensator, and finishing charging and discharging work at night by the storage battery; then dividing night peak time electricity price time intervals into night discharging working states according to time-of-use electricity prices, and dividing night off-peak time electricity price time intervals into night charging working states;
the method adopts a hierarchical control method to realize the fluctuation stabilizing mode, and the hierarchical control method comprises the following specific steps:
(1) Scheduling commands and voltage u from power system PQ s Calculating to obtain a grid-connected reference current
The calculation formula is shown as (1), the upper layer controller receives a grid-connected reference current instruction, and generates an upper layer power supply instruction through the PR controller and transmits the upper layer power supply instruction to the lower layer controller;
(2) The lower layer controller is divided into a photovoltaic controller and a storage battery controller, and the output voltage v of each photovoltaic unit is firstly received by the photovoltaic controller pvm And current i pvm Wherein m is a positive integer and 0<m<M, independent mppt control is carried out to obtain maximum power voltage v pvm * Then tracking the maximum power voltage v by the PI controller pvm * With the actual photovoltaic voltage v pvm Error between, and finally, the unit current command vector is superimposed
The modulation signal of each photovoltaic cell is obtained through voltage stabilization;
(3) The storage battery controller receives a difference signal of the sum of the upper power supply instruction and all photovoltaic battery instructions, performs battery SOC balance control, and generates a modulation signal of each storage battery;
(4) Inputting the modulation signal of each photovoltaic cell and the modulation signal of each storage battery into a carrier phase shift modulator to generate a driving signal driving circuit;
calculating to obtain grid-connected reference current through Q dispatching instruction of power system in self-charging mode
The input control system finishes hierarchical control, and the calculation formula is shown as (2):
the night mode control method comprises the following steps:
(1) The power control comprises storage battery open-loop voltage control and capacitor closed-loop current control, wherein the storage battery open-loop voltage control is implemented according to a fixed modulation ratio K, an open-loop voltage phase alpha and a power grid voltage u calculated by the phase s Phase theta, generating a battery module modulation signal u bat (ii) a Capacitor closed loop currentIn the control, the sum of the direct-current voltages of the capacitors is subjected to closed-loop control to generate a direct-current voltage error, and then the current phase sin beta and the amplitude calculated from the phase are superposed to generate a grid-connected reference current i ref Then, capacitor closed-loop current control is carried out, and finally, voltage feedforward is added to eliminate voltage fluctuation and generate a capacitor module signal u cap ；
(2) The balance control comprises battery SOC balance control and capacitor voltage balance control, and respectively receives the battery module modulation signal u bat And capacitor module modulation signal u cap Balancing the SOC of each storage battery and the voltage of each capacitor by adopting an active voltage vector superposition method to generate a modulation signal of each storage battery unit and each capacitor unit; then, the modulation signal of each battery and the modulation signal of each capacitor are input to a carrier phase shift modulator to generate a drive signal drive circuit.
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| CN111371110A (en) * | 2020-02-21 | 2020-07-03 | 江苏南自通华电力自动化股份有限公司 | Off-grid single-phase cascade photovoltaic energy storage hybrid system and control method thereof |
| CN111509775B (en) * | 2020-04-30 | 2022-09-13 | 南京理工大学 | Integrated structure based on MMC optical storage hybrid inverter and power distribution method |
| CN112383082B (en) * | 2020-08-26 | 2022-09-16 | 平高集团有限公司 | Light storage hybrid system and multi-mode redundancy control method thereof |
| CN112531773B (en) * | 2020-11-27 | 2023-06-30 | 阳光新能源开发股份有限公司 | New energy power generation system and energy regulation and control method and device thereof |
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